As if the US Open couldn't get any more exciting, last night Serena defeated Carina Witthöft in the second round, advancing to the third round, where she'll face off with her big sister Venus sooner than expected in the tournament. Ahead of one of the most anticipated meetups, Venus spoke to POPSUGAR about how she prepares for tournaments and what it has been like competing against her sister for the past 20 years. "We're sisters through the whole match," she said. "That never stops."

During last night's press conference, Serena echoed those sentiments. "We make each other better; we bring out the best when we play each other. It's what we do," she said.

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When asked what the toughest part emotionally is playing Venus, she replied, "I never root against her no matter what . . . when you always want someone to win, to have to beat them . . . that's the hardest part."

Venus and Serena will compete tomorrow in Flushing Meadow, NY. The time is TBD.